Telescopic micrometer-gage.



Patented Nov. I2, |901.

T. WIEDEMANN.

fTELESGOPH." MIGROMETER GAGE.

l (Application led Dec. 15, 1900.)

(llo Model.)

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UNITED STATES PATENT OFFICE.

THEODORE WI'EDEMANN, OF PHILADELPHIA, PENNSYLVANIA.

TELESCOPIC MICROMETER-GAGE.

l SPCIFICATION forming part of Letters Patent No. 686,497, dated November 12, 1901.

Application led December 15, 1900. Serial No. 39,972. (No model.)

To all wiz/0W t may concern;

Be it known that LTHEoDoRn WIEDEMANN, a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Improvement in Telescopic Micrometer- Gages, of which the following is a specification.

My invention consists of an improved construction of a telescopic micrometergage which can be cheaply manufactud and is not liable to get out of order and which can be put to the same variety of uses as more eX- pensive instruments of this character.

The invention also consists of novel means whereby the same can be readily utilized for measuring interior diameters of varying area according to requirements.

It also consists of novel details of construction, all as will be hereinafter fully described, and particularly pointed out in the claims.

Figli re 1 represents a side elevation of a telescopic micrometer-gage embodying myinvention. Fig. 2 represents alongitudinal sectional View of Fig. 1. Fig. 3 representsalongitudinal sectional view of a portion of the gage similar to the parts seen in Fig. 2, but viewed atV a different angle. Fig. 4 represents an end elevation of a portion of the gage to be hereinafter referred to. Fig. 5 represents a side elevation of a portion of the gage, showing the scale thereon. Fig. 6 represents a side elevation, partly in section, showing the points seen in Figs. 1 and 2 removedand a shell containing an extension of wood or other material inserted in position.

Similar numerals of reference indicate corresponding parts in the figures.

Referring to the drawings, l designates lthe gage, the same consisting of the main tube 2, which has one' end threaded and adapted to engage the threaded plug 3, which latter is provided with the flange or shoulder 4, which abuts against the extremity of the tube 2, said plug also having the extension 5, upon which flange and extension is fitted the shell 6, having the point or contact part 7 in threaded engagement therewith. The shell 6 is forced tightly over the contiguous parts of the threaded plug'3, thereby forming a solid screw-shell, said shell fitting neatly over the exterior of the tube 2 and having one extremthreaded plug 3, which latter is split at 3 for i aV portion of its whole length, in the present instance about two-thirds, whereby ample provision is made to take up any possible Wear between the threaded plug 3 and the threaded end of the tube 2. The end of the tube 2 opposite to the threaded plug 3 is provided with a tapered nut 12,Whereby the tube 13, Which telescopes within the tube 2, can be held inany desired position. On the outer extremity of the telescopic tube 13 is located the nut 14, substantially similar in construction to the nut 12, said nut 14 serving to hold in the desired position the rod or contact part 15.

16 designates a sleeve which is tted over 'the tube2 and is connected by the pin 17 to the tube 13, whereby said'tube 13 and the sleeve '16 always move in unison inside as Well as 21 designates a spiral tension device that I consists of a spring which has one end thereof contacting with the pin 17, while the other end of said spring abuts against the plunger 22, which is provided with the stem 23, which causes the spring 21 to be retained at all times in proper position relative to said plunger, the latter resting against the contiguous shoulder or extremity of the threaded plug 3, as will b e understood from Fig. 2.

WVhen it is desired to lengthen the gage, I remove the threaded point 7 and insert therein the threaded stem 24 of the threaded shell 25, into which latter is inserted the eX- tension 26, whereby the gage can be lengthened to any desired extent, as is evident.

It will be apparent from the foregoing that IOO ' tubes 2 and 13 and the graduations 2O on said tube 2, and it will be further apparent that by tightening the two nuts 12 and 14 on the ends of the tubes the device can be readily used as a solid gage.

It is understood, of course, that by means of the split end of the tube 13 and the nut 14 the rod 15 can be adjusted so as to increase' or diminish the length of the instrument and that by means of the nut 12 the tube 13 can be held in any adjusted position. For instance, after a certain measurement has been taken this nut 12 can be tightened up, so as t-o retain the parts in such position. In using this micrometer, for instance, for measuring the inside diameter of a pipe or other tubular object the tube 13 is telescoped within'the tube 2 against the tension of the spring and placed within the pipe or other object and then released. The tension device or spring 21 will force the tube 13 downwardly until the rod or contact-point 15 and the point or contact part 7 engage opposite sides of the pipe. The measurement can then be read upon the gage 2O on tube 2, or the nut 12 can be tightened and the micrometer removed. The shell G, which is used to indicate in the presentinstance variations amounting only to one-thousandth part of an inch, by being rotated is moved longitudinally relative to the tube 2, the graduations 9 on said sleeve indicating such measurement in connection with any suitable fixed point on the tube 2.

I-Iaving thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In a micrometer-gage, the combination of a main tube, an inner tube telescoping therein, a shell rotatably movable on said main tube, a series of graduations on said main tube, a sleeve longitudinally movable on the latter, and contact parts carried by the extremities of said gage.

2. In a micrometer-gage, a main tube having a threaded plug in engagement therewith, a shell mounted on said plug and main tube, a sleeve carried by the latter, an inner tube telescoping within said main tube, a pin common to said sleeve and inner tube, said pin being movable in slots in said main tube, a plunger located Within'said main tube, and a spring intermediate said pin and plunger.

3. In a micrometer-gage, a main tube having a threaded plug in engagement therewith,

a shell mounted on said plug and main tube, a sleeve carried by the latter, an inner tube telescoping Within said main tube, a pin common to said sleeve and inner tube, said pin being movable in slots in said main tube, a

plunger located within said main tube, and a spring intermediate said pin and plunger, in combination with a rod telescopieally mounted Within said inner tube.

4. In a micrometer-gage, a main tube having a threaded plug in engagement therewith, said plug being split for a portion of its length, a screw seated in said plug and having a tapered head, a shell mounted on said plug and main tube, a series of graduations on the latter, a sleeve longitudinally movable .on said main tube, and contact parts carried ntube and main tube.

6. In a micrometer-gage, a main tube having a scale thereon, a sleeve mounted on said main tube, an inner tube telescoping within said main tube, a rod telescoping within said inner tube, and a tension device common to said main tube and inner tube.

7. In a micrometer-gage, a main tube having a split plug in engagement with one end thereof, a screw having a tapered head seated in said plug, a shell mounted on said plug and main tube and provided with graduations, a sleeve mounted on said main tube, the latter having a scale thereon, an inner tube telescoping within said main tube, a rod adjustably mounted in said inner tube, nuts for holding said inner tube and rod in any desired position, a pin common to said sleeve and inner tube, a plunger located within said inner tube, and a spring intermediate said plunger and pin.

8. Inamicrometer-gage, a main tube, an inner tube telescopically mounted therein, a shell mountedon said main tube and interiorly threaded for the reception of an extension, an adjustable rod mounted in the opposite extremity of said gage, and means for securing said rod in adjusted position.

THEODORE WIEDEMANN.

Vitnesses:

Joni.Y A. WIEDERSHEIM, E. HAYWARD FAIRBANKS.

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